nspamper is an event driven client to update dynamic DNS entries via Nsupdates. It robustly copes with network problems by retrying until DNS returns the the new IP address. It also correctly handles the case where the link dropped and re-established before the last attempt succeeded by using the latest IP address. Only a minimum of configuration options are required.
The Zero Calorie DNS is a domain name server for which the binary weighs in at 26K, that has no dependencies other than the minimal FreeBSD 6.0 installation. The server responds to "name server" (NS), "start of authority" (SOA), "address record" (A), "reverse address" (PTR), and "mail exchanger" (MX) requests. The server is fairly fast because the feature set has been trimmed down to the bare minimum. A few things are hard-coded so that a two minute setup is easy to accomplish. The hard-coding means that it may not be for everyone, however.
dnscacheaudit is a simple Perl utility to audit entries in the BIND cache. At the end of each run, it creates a PDF report showing the number of domains in the BIND cache that have a different IP address in the cache than the reference servers. This utility is inspired by the CacheAudit utility by Jose Avila.
mydns_admin is a simple but functional Web interface for the MyDNS DNS server. It allows you to add and edit zones and resource records from a browser. Lightweight and simple, the interface has very few dependencies and consists of only two files - the CGI and an HTML template. The template allows complete customization of the interface without changing the CGI.